EP3051300A1 - Vorrichtung zur erkennung von rauschen in der stromversorgung von plc-analogeingangs- und ausgangsmodulen - Google Patents

Vorrichtung zur erkennung von rauschen in der stromversorgung von plc-analogeingangs- und ausgangsmodulen Download PDF

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Publication number
EP3051300A1
EP3051300A1 EP16150737.1A EP16150737A EP3051300A1 EP 3051300 A1 EP3051300 A1 EP 3051300A1 EP 16150737 A EP16150737 A EP 16150737A EP 3051300 A1 EP3051300 A1 EP 3051300A1
Authority
EP
European Patent Office
Prior art keywords
voltage
noise
determination target
target voltage
noise determination
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP16150737.1A
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English (en)
French (fr)
Inventor
Jung Wook Kim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LS Electric Co Ltd
Original Assignee
LSIS Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LSIS Co Ltd filed Critical LSIS Co Ltd
Publication of EP3051300A1 publication Critical patent/EP3051300A1/de
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/26—Measuring noise figure; Measuring signal-to-noise ratio
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/16585—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 for individual pulses, ripple or noise and other applications where timing or duration is of importance
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0046—Arrangements for measuring currents or voltages or for indicating presence or sign thereof characterised by a specific application or detail not covered by any other subgroup of G01R19/00
    • G01R19/0053—Noise discrimination; Analog sampling; Measuring transients
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
    • G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
    • G01R19/16552—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies in I.C. power supplies
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/22—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using conversion of ac into dc

Definitions

  • the present disclosure relates to an apparatus for detecting noise in power supply of PLC analog input/output module. More particularly, the present disclosure relates to an apparatus for detecting noise in a power supply of a PLC analog input/output module which is capable of detecting whether a noise is introduced in electric power outputted by the power supply of the PLC analog input/output module.
  • a PLC Programmable Logic Controller
  • the PLC includes a memory storing programs and various data and may perform functions such as numerical calculation, logical calculation, sequencing control, timer, counter, etc.
  • the PLC may be applied to various operations such as device control, device numerical setting, time control, real-time monitoring, real time data collection and safe device activation.
  • the PLC includes an analog output module for providing signals to automation facility equipment, and an analog input module for receiving the signals output from the automation facility equipment.
  • the analog input module plays a role of converting an analog signal delivered from the automation facility equipment into a digital signal and delivering the digital signal to an internal operation processing unit.
  • the analog output module plays a role of receiving the digital signal from the operation processing unit, converting the digital signal into an analog signal and delivering the analog signal to the automation facility equipment.
  • a power supply configured to supply electric power for operation of the analog input/output module.
  • the power supply converts electric power inputted from the outside to the electric power required for operation of the analog input/output module, and supplies the electric power to the analog input/output module.
  • the electric power supplied by the power supply is required to be maintained stable, in order for the analog input/output module to be operated normally.
  • the output voltage of the power supply becomes unstable.
  • the analog input/output module can neither receive an accurate analog signal input nor output accurate analog signal. This phenomenon causes degradation in quality and performance of the product.
  • an object of the present disclosure is to provide an apparatus for detecting noise in a power supply of a PLC analog input/output module which is capable of detecting whether a noise is introduced in electric power outputted by the power supply of the PLC analog input/output module.
  • an apparatus for detecting noise in a power supply of a PLC analog input/output module comprising: a capacitor configured to extract a noise determination target voltage from a driving voltage outputted from the power supply; a voltage conversion unit configured to convert the noise determination target voltage outputted from the capacitor and to output the converted noise determination target voltage; a comparison unit configured to compare the noise determination target voltage converted by the voltage conversion unit with a reference voltage; and a determination unit configured to determine whether the noise determination target voltage is a noise, based on a comparison result by the comparison unit.
  • the voltage conversion unit may include: a half-wave rectifier configured to half-wave rectify the noise determination target voltage outputted from the capacitor; an inverting adder configured to invert and add the noise determination target voltage half-wave rectified by the half-wave rectifier; an inverting amplifier configured to output the noise detection determination target voltage inverted and added by the inverting adder in an inversed form of a same size; and a low pass filter configured to low-pass filter the noise determination target voltage inverted by the inverting amplifier.
  • the comparison unit may output a positive voltage or a negative voltage when the noise determination target voltage is higher than the reference voltage, or may output a negative voltage or a positive voltage when the noise determination target voltage is lower than the reference voltage.
  • the determination unit may output a high level voltage or a low level voltage when the noise determination target voltage is determined to be a noise, or may output a low level voltage or a high level voltage when the noise determination target voltage is determined not to be a noise.
  • the determination unit may be an NMOS (N-channel Metal-Oxide-Semiconductor) FET (Field Effect Transistor) or a PMOS (P-channel MOS) FET configured to be turned on or turned off, according to the comparison result outputted from the comparison unit.
  • NMOS N-channel Metal-Oxide-Semiconductor
  • PMOS P-channel MOS
  • the apparatus for detecting noise in a power supply of a PLC analog input/output module may detect whether a noise is introduced in electric power outputted by the power supply of the PLC analog input/output module, when the power supply for supplying electric power to the PLC analog input/output module outputs an unstable voltage due to noise.
  • the noise introduced in electric power supplied by the power supply for supplying the electric power to the PLC analog input/output module is detected in advance, so that the noise may be prevented from being supplied to the PLC analog input/output module.
  • the malfunction occurrence rate of the PLC analog input/output module may be reduced, and thereby time and cost consumed in trouble shooting can also be reduced.
  • FIG. 1 is a block diagram illustrating an example of a PLC system including an apparatus for detecting noise in a power supply of a PLC analog input/output module according to an exemplary embodiment of the present disclosure.
  • the PLC system may include an analog module (100), a power supply (200) and a noise detection apparatus (300), and may further include other components. However, only components required for description of the present disclosure are illustrated herein.
  • the analog module (100) may be an analog input module configured to convert an analog signal provided from a sub-device to a digital signal and provide the digital signal to an internal calculation process unit, and may be an analog output module configured to receive a digital signal reflecting a calculation process result provided by the calculation process unit, convert the digital signal to an analog signal, and provide the analog signal to the sub-device.
  • the power supply (200) is a structure in order to supply a driving electric power required for driving the analog module (200).
  • the power supply (200) convert electric power applied from the outside to an electric power of appropriate level for driving the analog module (100), and may provide the converted electric power to the analog module (100).
  • the noise detection apparatus (300) may detect whether a noise is introduced in electric power outputted from the power supply (200).
  • the structure of the noise detection apparatus (300) will be described hereinafter based on the enclosed drawings.
  • FIG. 2 is a block diagram illustrating an apparatus for detecting noise in a power supply of a PLC analog input/output module according to an exemplary embodiment of the present disclosure
  • FIG. 3 is a detailed circuit diagram of a PLC analog input/output module according to an exemplary embodiment of the present disclosure
  • FIG. 4 is a view illustrating an example of output voltage waveform of each partial structure of an apparatus for detecting noise in a power supply of a PLC analog input/output module according to an exemplary embodiment of the present disclosure.
  • the apparatus (300) for detecting noise in a power supply of a PLC analog input/output module may include a capacitor (310), a voltage conversion unit (320), a comparison unit (330), a reference voltage generation unit (340) and a determination unit (350).
  • the capacitor (310) may be configured to extract a noise from a driving voltage outputted from the power supply (200).
  • the capacitor (310) has a characteristic to block direct current ingredients, and the driving voltage is of direct current. Therefore, the output voltage of the capacitor (310) becomes '0', unless a noise is included in the driving current.
  • the capacitor (310) outputs an alternate current voltage corresponding to the noise, when the noise is included in the driving voltage.
  • the voltage (V 1 ) outputted from the capacitor (310) is used in order to determine whether a noised is included.
  • the voltage (V 1 ) will be referred to as a 'noise determination target voltage'.
  • the voltage conversion unit (320) may convert the noise determination target voltage in an alternate current form outputted from the capacitor (310) and output the converted noise determination target voltage.
  • the voltage conversion unit (320) may output the noise determination target voltage, by half-wave rectifying and low pass filtering the noise determination target voltage. Detailed structure and operation of the voltage conversion unit (320) will be described hereinafter.
  • the comparison unit (330) may compare the noise determination target voltage converted by the voltage conversion unit (320) with a reference voltage (Vref) outputted from the reference voltage generation unit (340) and may output the comparison result.
  • the comparison result (V 6 ) may be a negative (-) or a positive (+) voltage.
  • the volume of the negative (-) and the positive (+) voltage may be identical to each other.
  • the comparison unit (330) may compare the noise determination target voltage with the reference voltage (Vref), and may output a negative (-) voltage when the noise determination target voltage is higher than the reference voltage, or output a positive (+) voltage when the noise determination target voltage is lower than the reference voltage.
  • the comparison unit (330) may compare the noise determination target voltage with the reference voltage (Vref), and may output a positive (+) voltage when the noise determination target voltage is higher than the reference voltage, or output a negative (-) voltage when the noise determination target voltage is lower than the reference voltage.
  • the reference voltage generation unit (340) may generate a reference voltage used for the comparison unit (330) to compare with the noise determination target voltage.
  • the determination unit (350) may receive the comparison result outputted from the comparison unit (330), and may determine whether the noise determination target voltage is a noise and output the determination result.
  • the determination unit (350) may be configured to output voltages of different levels based on the determination result.
  • the determination unit (350) may be an NMOS (N-channel Metal-Oxide-Semiconductor) FET (Field Effect Transistor) or a PMOS (P-channel MOS) FET.
  • the determination unit (350) may output a high level voltage when the comparison result received from the comparison unit (330) is a positive (+) voltage, or may output a low level voltage when the noise determination target voltage is a negative (-) voltage.
  • the determination unit (350) may output a low level voltage when the comparison result received from the comparison unit (330) is a positive (+) voltage, or output a high level voltage when the noise determination target voltage is a negative (-) voltage.
  • the voltage conversion unit (320) may include a half-wave rectifier (321), an inverting adder (322), an inverting amplifier (323) and a low pass filter (324).
  • the half-wave rectifier (321) may half-wave rectify the noise determination target voltage having passed through the capacitor (310) ( FIG. 4(b) ).
  • the inverting adder (322) may invert and add the noise determination target voltage that has been half-wave rectified by the half-wave rectifier (321) ( FIG. 4(c) ).
  • the half-wave amplifier (323) may output the noise determination target voltage inverted and added by the inverting adder (322) as a voltage in an inverted waveform of the same volume ( FIG. 4(b) ), and the low pass filter (324) may low pass filter the noise determination target voltage inverted by the inverting amplifier (323) ( FIG. 4(e) ).
  • the half-wave rectifier (321) may include first and second resistors (R1, R2), a first opi-amp (321 a), first and second diodes (D1, D2).
  • a negative (-) input terminal the first opi-amp (321a) may be connected to the capacitor (310) and a positive (+) input terminal may be earthed.
  • the first resistor (R1) may be connected between a negative (-) input terminal of the first opi-amp (321a) and the capacitor (310).
  • An anode of the first diode (D1) may be connected between a negative (-) input terminal of the first opi-amp (321a) and the first resistor (R1), and a cathode of the first diode (D1) may be connected to an output terminal of the first opi-amp (321a).
  • an anode of the second diode (D2) may be connected to an output terminal of the first opi-amp (321a), and a cathode of the second diode (D2) may be connected to an output side of the half-wave rectifier (321).
  • a side of the second resistor (R2) may be connected between the first resistor (R1) and the first opi-amp (321a), and another side of the second resistor (R2) may be an output side of the half-wave rectifier (321).
  • the second resistor (R2) may be connected to an anode of the first diode (D1) and a cathode of the second diode (D2).
  • the first resistor (R1) and the second resistor (R2) are set as the same value, and when the noise determination target voltage (V1) is higher than zero (0), the first diode (D1) is turned on and the second diode (D2) is turned off so that the output voltage (V2) of the half-wave rectifier (321) becomes zero (0).
  • the polarity of an area where the noise determination target voltage (V1) is under zero (0) may be changed and outputted as an output voltage (V2) of the half-wave rectifier (321).
  • the inverting adder (322) may include third to fifth resistors (R3, R4, R5) and a second opi-amp (322a).
  • a negative (-) input terminal of the second opi-amp (322a) may be connected to an output terminal of the half-wave rectifier (321), and a positive (+) input terminal of the second opi-amp (322a) may be earthed.
  • the third resistor (R3) may be connected between negative (-) input terminals of the capacitor (310) and the second opi-amp (322a)
  • the fourth resistor (R4) may be connected between an output terminal of the second opi-amp (322a) and a negative (-) input terminal of the second opi-amp (322a)
  • the fifth resistor (R5) may be connected between an output side of the half-wave rectifier (321) and a negative (-) input terminal of the second opi-amp (322a).
  • V 3 the output voltage (V 3 ) of the inverting adder (322) may be determined according to the following Equation 2.
  • V 3 - R 4 R 3 V 1 + R 4 R 5
  • V 2 - V 1 + 2 V 2
  • the output voltage (V 3 ) of the inverting adder (322) may be outputted as a negative (-) waveform in the same volume as that of the noise determination target voltage (V 1 ).
  • the inverting amplifier (323) may invert the output voltage (V 3 ) as a positive (+) waveform and output the inverted output voltage.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Programmable Controllers (AREA)
EP16150737.1A 2015-01-19 2016-01-11 Vorrichtung zur erkennung von rauschen in der stromversorgung von plc-analogeingangs- und ausgangsmodulen Withdrawn EP3051300A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150008573A KR101984548B1 (ko) 2015-01-19 2015-01-19 Plc 아날로그 입출력 모듈의 전원부 노이즈 감지장치

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EP3051300A1 true EP3051300A1 (de) 2016-08-03

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EP16150737.1A Withdrawn EP3051300A1 (de) 2015-01-19 2016-01-11 Vorrichtung zur erkennung von rauschen in der stromversorgung von plc-analogeingangs- und ausgangsmodulen

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US (1) US9778292B2 (de)
EP (1) EP3051300A1 (de)
JP (1) JP6093050B2 (de)
KR (1) KR101984548B1 (de)
CN (1) CN105807149B (de)

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Publication number Priority date Publication date Assignee Title
CN111239476B (zh) * 2018-11-29 2022-11-22 瑞昱半导体股份有限公司 信号检测器与信号检测方法
JP6970140B2 (ja) * 2019-05-23 2021-11-24 株式会社ソニー・インタラクティブエンタテインメント 電源ユニットの検査装置
CN113452237B (zh) * 2020-03-26 2022-06-24 立锜科技股份有限公司 具有降低音频噪音的电源供应控制器及降低音频噪音方法
WO2023053246A1 (ja) * 2021-09-29 2023-04-06 三菱電機株式会社 ノイズ検出装置およびｐｌｃシステム
CN117969978A (zh) * 2022-10-25 2024-05-03 华为技术有限公司 电源噪声检测电路及工作方法、抖动限幅电路、电子设备

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Also Published As

Publication number Publication date
KR20160089099A (ko) 2016-07-27
US9778292B2 (en) 2017-10-03
CN105807149B (zh) 2018-11-27
KR101984548B1 (ko) 2019-05-31
US20160216297A1 (en) 2016-07-28
JP6093050B2 (ja) 2017-03-08
CN105807149A (zh) 2016-07-27
JP2016134181A (ja) 2016-07-25

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